Wasta, SD 57792 Frost Dates
57792, near Wasta, SD: the frost window
Around 05/15 is the usual last spring frost, about 260 days away. Fall's first freeze usually shows up around 09/27, roughly 134 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Wasta in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Wasta's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Wasta's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/29 and only about 1 year in 10 sees frost after that.
Wasta against the rest of the dataset
About 134 days separate Wasta's last and first frost, putting it 38,035 of 40,283 ZIP codes nationally. Within SD, it ranks 355 of 378.
Learn more
Two guides worth reading on 57792: local microclimates, on what one yard in Wasta can differ from the 57792 normal, and zone vs. frost date, on why Zone 4b and Wasta's frost date answer different questions.